Warren Buffett's Berkshire Hathaway announced a number of structural changes before the legendary CEO steps aside at the end of this year, among them the departure of Todd Combs, investment officer and Geico CEO.

Combs, 54, will be joining JPMorgan Chase , where he already served on the board, as head of the bank's new Security and Resiliency Initiative, to find direct equity investments in the defense, aerospace, healthcare and energy industries.

Combs "has resigned to accept an interesting and important job at JPMorgan," said Buffett, 95, in a press release from Berkshire. "Todd made many great hires at GEICO and broadened its horizons. JPMorgan, as usually is the case, has made a good decision."

Combs joined Berkshire in 2010 from his hedge fund Castle Point and w

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